Category: Air Quality

  • Air Quality Permitting

    The Permitting Branch is responsible for issuing permits to commercial and industrial pollution sources in Utah. A New Source Review Approval Order (AO) is required if emissions of criteria pollutants are five tons per year or greater, or hazardous air pollutant (HAP) emissions are greater than 500 pounds per year for an individual HAP or…

  • Annual Conference:
    Science for Solutions

    DAQ Contact: Cate Youatt (cyouatt@utah.gov) Air Quality: Science for Solutions is a new annual conference on air quality, especially geared toward Utah and the Intermountain West. The mission of this conference is to facilitate a cross-pollination of ideas and the development of solutions to Utah’s air quality problems. This conference series targets academic researchers from…

  • Storage Tank Emissions Pilot Program (STEPP)

    Relevant Documentation Principal Investigators: The Utah Legislature’s 2016 budget included a $150,000 appropriation for the Utah Department of Environmental Quality (DEQ) to create a pilot program to screen for leaks of volatile organic compounds (VOC) primarily coming from the “thief hatch” on oil and gas-condensate storage tanks. DEQ proposed a partnership agreement with the Tri-County…

  • Growth & Decline Curve

    Oil and gas production appears to be the major source of ozone precursors in the Uinta Basin. The Division of Air quality seeks to maintain the regulatory ozone limits within the basin without impeding continued development. As such, the Division of Air Quality developed a model projecting future-year emission inventories in the oil and gas…

  • Non-Combustion Formaldehyde Study

    During the winters of 2012, 2013, and 2014, the Utah Department of Environmental Quality (DEQ) led a multi-disciplinary, multi-agency study of ozone formation in the Uinta Basin. Among other findings, these studies found that formaldehyde and other carbonyls play a key role in wintertime atmospheric ozone production. There are three main carbonyl sources in the…

  • Wasatch Front Wood Smoke: Modeling To Consider The Impact Of Emissions From Solid Fuel Burning Devices

    Background The 2015 Utah Legislature provided $70,000 to the Utah Division of Air Quality (DAQ) to undertake a modeling study to address two specific questions. What would be the effect of a two-stage program that would reduce emissions from wood-burning stoves while at the same time maximizing the number of days that EPA-certified stoves and…

  • Northern Utah Wood Burning Survey

    The Utah Department of Environmental Quality (DEQ) contracted with ICF International (ICF), an independent research and consulting firm, to conduct a survey of residents in seven northern Utah counties regarding their opinions surrounding air quality and their home heating and wood burning behaviors. Key objectives of the study included estimating the percentage of households in…

  • Utah Winter Fine Particulate Study (UWFPS)

    Executive Summary Northern Utah valleys experience elevated levels of particulate matter less than 2.5 micrometers in diameter (PM2.5) in winter. These pollution episodes are closely associated with periods of atmospheric stability known as Persistent Cold Air Pools (PCAPs) or, more commonly referred to as inversions. A typical Utah winter sees about 5 to 6 multi-day…

  • Winter Inversion Study

    Valleys along the Wasatch Mountains (Cache, Salt Lake and Utah) experience high levels of particulate matter (PM) in winter months and are currently designated as non-attainment area for particulate matter with diameters less than 2.5 micron (PM2.5). The chemical aspects of these pollution episodes are not well characterized. In order to fill in this gap…

  • Great Salt Lake Summer Ozone Study

    DAQ (Division of Air Quality) monitoring found high levels of ozone near the Great Salt Lake from 2010-2013. The Division also found a wide variance in the concentration of ozone in the stable air pocket over the lake during the summertime. Though the mechanisms behind air flow in lake and coastal regions have been studied…

  • Ozone: EPA Designates Marginal Nonattainment Areas in Utah

    The Wasatch Front and parts of the Uinta Basin were designated as Marginal nonattainment areas for ozone this week by the EPA. A Marginal designation is the least stringent classification for a nonattainment area and doesn’t require the state to submit a formal State Implementation Plan (SIP).

  • Great Salt Lake Ambient Hydrochloric Acid Study

    Atmospheric chlorine is a strong oxidant and known to potentially initiate photochemistry via reactions with various common hydrocarbons. Kerry et al (2013) found that chlorine atoms significantly contribute to local Salt Lake City PM2.5 during elevated wintertime episodes with ammonium chloride accounting for 10-15% of the PM2.5 mass. In order quantify the concentrations of local…

  • Wintertime Atmospheric Modeling

    Wintertime meteorological conditions in Utah are difficult to portray using conventional atmospheric-modeling approaches. To improve the accuracy of simulations of pollution along the Wasatch Front and Cache Valley, models need to better simulate the complex meteorological features associated with the cold-air pools that form during winter in the valleys of northern Utah. Specifically, models need…

  • Meteorological Modeling of 3 Wintertime Episodes

    Following the completion of the Winter Modeling Improvements study funded by DAQ with the original legislative research funding, DAQ contracted with the same research group for a targeted modeling project. The purpose of this was to model three past inversion episodes using the model improvements that resulted from the original study. The study was completed…

  • Chemical Mechanisms at Low Temperatures

    Wintertime ozone in the Uinta Basin is unique and requires improvements to the photochemical models used for winter conditions. Current chemical mechanisms within the modeling system assume a summertime temperature of 300 K (80° F) when performing important chemical reactions, far different from the wintertime temperatures in the Basin. In order to properly model the…

  • CAMx Snow Cover Treatment

    Wintertime ozone is a serious air quality issue in the Uinta Basin. The situation is unique and requires improvements to the photochemical models used for winter conditions. High concentrations of wintertime ozone occur over snow-covered surfaces. Snow cover influences wintertime ozone by increasing surface albedo and thus increasing photolysis rates, inhibiting the surface deposition of…

Back to top